The goal of the work was the investigation of hollow waveguide utilization for near infrared laser radiation delivery. As
basic delivery unit, a new thin cyclic olefin polymer coated silver hollow glass waveguide with diameters 100/190 μm or
250/360 μm and length up to 20 cm was used. Four near infrared laser sources were based on the Nd:YAG crystals. The
first one - Nd:YAG laser passively Q-switched by LiF:F2- saturable absorber - was coherently pumped by Alexandrite
radiation. The system generated 1.06 μm wavelength radiation with 6 ns length of pulse and 0.7 mJ maximum output
energy. The second and third laser systems were compact longitudinally diode pumped Nd:YAG lasers generating
radiation at wavelength 1.06 μm and 1.44 μm. These lasers were operating in a free-running regime under pulsed
pumping (pulse repetition rate 50 Hz). Mean output power 160 mW (90 mW) with pulse length 0.5 ms (1 ms) was
generated at wavelength 1.06 μm (1.44 μm). The last radiation source was the Nd:YAG/V:YAG microchip laser pumped
by laser diode and generating the radiation at 1.34 μm wavelength. The output power, pulse length, and repetition rate
were 25 mW, 6 ns, and 250 Hz, respectively. All lasers were generating beam with gaussian TEM00 profile. These
radiations were focused into thin a waveguide and delivery radiation characteristics were investigated. It was recognized
that the output spatial structure is significantly modified in all cases. However a compact delivery system can be useful
for near infrared powerful radiation delivery in some special technological and medical applications.